Hello everyone! I have a problem with using tux gem and sinatra on win8 platform. When i try to execute the tux gem there is appears the following error. The screenshot pinned. Bundle install command didn't solve an issue. Thank you in advance! :)

This appears to be a problem with your environment, as you seem to have multiple versions of sinatra installed on your system -- however unable to activate it.
I would recommend to report this issue, with any steps to reproduce it, to the tux gem you are using.
Yep, I've just clean up old versions of Sinatra and the problem has gone. Thanks! :)
@polyglot0027 Glad you figured it out! <3
Most helpful comment
This appears to be a problem with your environment, as you seem to have multiple versions of sinatra installed on your system -- however unable to activate it.
I would recommend to report this issue, with any steps to reproduce it, to the
tuxgem you are using.